Just to add to this conversation, I have an all clay pond about half acre. We put CC in about four years ago, not thinking they would spawn. Last September my grandkids pulled out two CC weighting over 10 pounds and 28 and 29 inches long! And had lots of 10-12 inch feeding during the summer, way more than the 25 we put in ! I have not added anything talked about for spawning.

half-acre pond, LMB, HBG, BG, GSH and CC ....goal is to
have fun fishing. And I subscribe!